test sprockets with custom js_dir

features/sprockets.feature

@@ -3,4 +3,9 @@ Feature: Sprockets
   Scenario: Sprockets require
     Given the Server is running at "test-app"
     When I go to "/javascripts/sprockets_base.js"
+    Then I should see "sprockets_sub_function"
+    
+  Scenario: Sprockets require with custom :js_dir
+    Given the Server is running at "sprockets-app"
+    When I go to "/library/javascripts/sprockets_base.js"
     Then I should see "sprockets_sub_function"

fixtures/sprockets-app/config.rb

@@ -0,0 +1 @@
+set :js_dir, "library/javascripts"

fixtures/sprockets-app/source/library/javascripts/sprockets_base.js

@@ -0,0 +1,5 @@
+//= require "sprockets_sub"
+
+function base() {
+  
+}

fixtures/sprockets-app/source/library/javascripts/sprockets_sub.js

@@ -0,0 +1,3 @@
+function sprockets_sub_function() {
+  
+}

lib/middleman/core_extensions/sprockets.rb

@@ -10,6 +10,7 @@ module Middleman::CoreExtensions::Sprockets
           run JavascriptEnvironment.new(app)
         end
       end
+      
       # app.map "/#{app.css_dir}" do
       #   run StylesheetEnvironment.new(app)
       # end